Completes the implementation of the encryptClientServer parameter .

[corentin-soriano]

It is very useful to be able to disable client/server communication encryption for debugging or using an application firewall.
The encryptClientServer parameter was already present in the tp.config.php, and the JavaScript part was already prepared.

It should be noted that the encryption seems unnecessary since it is symmetric, and the key is present throughout all communications:

• Anyone with a tool like Wireshark can read the encrypted content as well as the private key in the same request.
• It significantly slows down the application: Teampass is much more responsive without this encryption.
• An administrator concerned about the security of exchanges will systematically use TLS.

During my tests I noticed that the stripHtml function is vulnerable to XSS injection since it creates unsafe elements in the DOM.
As there was no consistency in using it, I removed its call and definition.